M:
Mapping Water Use from Space - Webcast - Webcast of a talk at the Library of Congress. Martha Anderson, PhD., talks about using images from the Landsat satellite program to monitor water use and drought on U.S. farms. It is used to measure evapotranspiration, the total amount of water used in the process of growing crops. [U.S. Library of Congress (LOC)]

N:
National Wetlands Inventory (NWI) - Generates information about the characteristics, extent and status of the Nation's wetlands and deepwater habitats [U.S. Department of the Interior (DOI), U.S. Fish and Wildlife Service]